Inbucket is an email testing service, similar to Mailinator. It accepts messages for any email address and makes them available to view via a Web interface. It allows Web developers, software engineers, and system administrators to quickly see the emailed output of their applications. No per-account setup is required. Mailboxes are created on the fly as mail is received for them, and no password is required to browse the content of the mailboxes.

DataNucleus AccessPlatform is a standards-compliant Java persistence product. It is fully compliant with the JDO1, JDO2, JDO2.1, JDO2.2, JDO3, JPA1, JPA2 and JPA2.1 Java standards, and provides a REST API. It complies with the OGC Simple Feature Spec for persistence of geospatial Java types. It allows access to all popular RDBMS available today, together with the MongoDB, LDAP, NeoDatis, JSON, Excel/ODF spreadsheets, XML, BigTable, HBase, and Neo4j databases.

Elefant is a full-featured, but refreshingly simple CMS and PHP Web framework. It features an intuitive, streamlined admin interface, a tightly integrated WYSIWYG editor, dynamically embeddable content objects for building dynamic Web sites without touching code, and an extremely fast, secure, and flexible framework for add-ons and themes. The core CMS includes page editing, a blogging engine, site navigation, file and user management, automatic version control, a tool for translators and multilingual site management, and an in-browser theme/layout editor. It is also extensively documented and has a small but friendly and active developer community.

The Inception Framework leverages well-known Open Source tools to establish a solid base for
Web- and service-oriented applications.
It works with RESTEasy,
Jetty,
Web Sockets,
Angular,
MySQL,
and Hibernate.
Models are created using a Web interface.

Corn Gate is designed to simplify service definitions and implementations in Java. It comes with several handy out-of-the-box functionalities, including security, registry, Spring and EJB integration, filters, shared data stages, client contexts, etc. JSON-RPC/HTTP and REST/HTTP protocols are supported. Remote service calls can be done through various client technologies. Since Gate supports standard HTTP communication mechanisms, almost any client technology can access services remotely.

RoboZombie allows easy integration with remote services by allowing you to replicate an endpoint contract and generate a proxy to access it.
Contracts can be very flexible in terms of the resources they access. These could be vary from static HTML content or an RRS feed, to a RESTful web service endpoint.
Each endpoint contract is specified on a single interface using annotations to provide the communication metadata. It is then wired into your code via an annotation, where it is created, cached, and injected at runtime.

Sails.JS is a NodeJS MVC framework made with building API apps quickly in mind. It provides a RESTful JSON API, Websocket Support, ORM-based database connections, and support for many databases via adapters.